基于非线性储能与释放特征的煤冲击倾向性指标

doi:10.13722/j.cnki.jrme.2020.1204

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摘要煤的冲击倾向性是煤矿冲击地压灾害发生与否及致灾程度的重要影响因素，冲击倾向性指煤积聚应变能并产生冲击破坏的性质，因此，峰值强度时刻弹性能量积累是冲击倾向性评价的关键。因煤富含结构缺陷，破坏过程和能量演化更加复杂，针对此种煤样峰值强度时刻弹性能量无法准确求得的难题，对标准煤样进行单轴循环加卸载试验，以获取煤样不同应力状态下弹性应变能积累量，发现弹性应变能积累与应力–应变曲线变化趋势一致，在峰值强度时刻达到最大值。能量输入、弹性能量积累及能量耗散随煤样受载变形呈非线性演化规律，但在任一时刻应力的平方与弹性能量积累表现出良好线性关系。基于此改进峰值强度时刻弹性能量积累量计算方法，更加准确获取试件峰值强度时刻弹性应变能积累量。进一步提出综合考量煤体强度、能量演化及破坏时间的有效弹性能释放速率指数KET评价煤的冲击倾向性，并结合现有指标给出冲击倾向性分类临界值。最后采用远场碎屑质量占比及平均粒径da表征的煤样破碎程度验证评价结果合理性。研究结果表明：KET可有效解决现有各项指标评价结果离散性大且相互之间存在冲突的局限性；冲击倾向性KET评价结果与煤样破坏状态对比，发现KET与及破碎程度正相关，与da负相关，评价结果更符合实际。

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	卢志国1
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	鞠文君1
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	高富强1
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	伊康1
	4
	孙卓越1
	2

关键词 ：岩石力学, 冲击倾向性, 能量演化, 非线性储能, 弹性应变能积累量, 有效弹性能释放速率, 煤样破碎程度

Abstract：The bursting liability of coal is an important factor affecting the occurrence of rock burst and the degree of disaster. Bursting liability refers to the property that coal accumulates strain energy and produces impact failure，and hence，elastic energy accumulation at the peak strength is the key to evaluate impact propensity. Due to that there are enormous structural defects in coal，the failure process and energy evolution of coal are very complex. Uniaxial cyclic loading and unloading tests were carried out on standard coal samples to obtain the accumulated elastic strain energy under different stress states. It is found that the variation trend of the elastic strain energy density curve is almost consistent with that of the stress-strain curve，and the elastic strain energy reaches the maximum value at the peak strength moment. It is also shown that the energy input，elastic energy accumulation and energy dissipation have a nonlinear evolution law with the loading deformation of coal samples，but that at an arbitrary time，the stress square and the elastic energy accumulation show a good linear relationship. Based on the improved calculation method of the elastic energy accumulation at the peak strength moment，the elastic strain energy accumulation at the moment of the peak strength can be obtained more accurately. The effective elastic energy release rate index KET，which can comprehensively consider the coal strength，the energy evolution and the failure time，was proposed to evaluate the coal bursting liability，and combined with the existing indexes，the classification critical values of the bursting liability was given. Finally，the rationality of the evaluation results was verified by the fragmentation degree of coal samples(far-field debris mass ratio ω and average particle size da). The research results show that KET can effectively solve the limitations of large dispersion and conflict among existing evaluation results of various indicators. Compared with the failure state of coal samples，KET has positive correlation with ω and fragmentation degree and has negative correlation with da，which is more in line with the reality.

Key words： rock mechanics')" href="#">

rock mechanics bursting liability energy evolution nonlinear energy storage elastic strain energy accumulation effective elastic energy release rate ')" href="#">fragmentation degree of coal sample

引用本文:

卢志国1，2，3，鞠文君1，2，3，高富强1，2，3，伊康1，4，孙卓越1，2. 基于非线性储能与释放特征的煤冲击倾向性指标[J]. 岩石力学与工程学报, 2021, 40(8): 1559-1569.
LU Zhiguo1，2，3，JU Wenjun1，2，3，GAO Fuqiang1，2，3，YI Kang1，4，SUN Zhuoyue1，2. Bursting liability index of coal based on nonlinear storage and release characteristics of elastic energy. , 2021, 40(8): 1559-1569.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1204 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I8/1559

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